Can someone explain to me again, why a company such as deezer is so stupid and interferes when opensource components are built to user their service.

Especially now, not long after libspotify was discontinued, you should really not only leave opensource developers alone, you should encourage them or even put your own developers on it.

If there are a working plugin for home assistant and openhab, you would have a massive potential userbase - but someone making strategic decisions at deezer seems not to understand that at all